Remove unittest.main() calls (#11304)

Remove unittest.main() calls.

tests/unit/plugins/modules/test_keycloak_client.py

@@ -7,7 +7,6 @@ from __future__ import annotations
 
 from contextlib import contextmanager
 
-import unittest
 from unittest.mock import patch
 from ansible_collections.community.internal_test_tools.tests.unit.plugins.modules.utils import (
     AnsibleExitJson,
@@ -149,7 +148,3 @@ class TestKeycloakRealm(ModuleTestCase):
 
         # Verify that the module's changed status matches what is expected
         self.assertIs(exec_info.exception.args[0]["changed"], changed)
-
-
-if __name__ == "__main__":
-    unittest.main()